[3, 2-c]-pyrazoles of steroids of the androstane and estrane series



United States Patent O 3,377/ 62 22 Claims. (Cl. 260-2395) This invention relates to [3,2-c1-pyrazoles of steroids of the androstane and estrane series. The compounds of the invention are represented by the general formula:

Re f Ra-N wherein R, R and'R are members selected from the group consisting of hydrogen and methyLR is a member selected from the group consisting of amino-, hydroxy-, chloro-, bromoand iodo-groups, and X is a single or double bond.

To prepare these compounds, which are endowed with remarkable anabolic activity, 2u-cyano-3-keto-steroids were reacted with hydrazine hydrate and methyl hydrazine to obtain [3,2-c]-5-amino-pyrazoles and 1'-methyl- 5'-amino-pyrazoles. By diazotization of these 5'-aminopyrazoles and substitution of the resulting diazo-derivative with chlorine, bromine, iodine or a hydroxy group, the required compounds were obtained.

The starting 2a-cyano-3-keto-steroids are obtained by alkali treatment of the corresponding [2,3-d]-isoxazoles (F. A. Zderic et al., Chemistry and Industry, 1960, page 1625, and R. 0. Clinton et al., Journal Organic Chemistry,

The following examples are offered for illustrative purposes, no limitation to the scope of the invention being intended.

EXAMPLE NO. 1

0.5 part of 98% hydrazine hydrate were added to a solution of 0.3 part of Za-cyano-Soa-androstane l7fi-ol-3-one in 6 parts of ethanol. After the mixture was refluxed for 2 hours, it was concentrated and then diluted with water, and the so-obtained product was recrystallized from methanol. Yield: 0.2 part of Sm-andrOstane-UB-ol- [3,2-c]- 5-amino-pyrazole; M.P. 244245 C.; [a] '=+55 (chloroform) The following compounds were prepared by the same procedure from the corresponding 2a-cyano-ketones:

17oz methyl 5a androstane-17f3-ol-[3,2-c]-5-aminopyrazole: M.P. 170-173 C.; [u] =+31 (chloroform); crystallization from methanol.

5 a-estrane-17B-o1-[3,2-c]-5 -amino-pyrazole: M.P. 300 C; [u] =+119 (chloroform); crystallization from methanol.

Androst 4 ene-17fi-ol-[3,2-c]-5-amino-pyrazole: M.P. 248-252 C.; [a] =-]-115 (ethanol); crystallization from methanol.

17 a-methyl-androst 4 ene 17 3 olj- [3,2-c] -5'-aminopyrazole: M.P. 250" C., [oz] =+94 (chloroform); crystallization from methanol.

- of ethanol.

ice

EXAMPLE NO. 2

0.60 part of methyl hydrazine sulfate and 4 parts of 2 N sodium hydroxide were added to a solution of 0.3 part of 2ot-cyano-5a-androstane-17fi-ol-3-one in 15 parts The mixture was refluxed for 4 hours, and then diluted with water and the product was recovered by filtration and recrystallized from methanol. Yield: 0.22 part of 5a-androstane-17B-ol-[3,2-c]-1'-methyl-5- arnino-pyrazole; M.P. 300 C.; [u] =+41 (pyridine).

The following compounds were prepared by the same procedure from the corresponding 2a.-cyano-3-ketones:

17oz methyl 5a androstane 17,8-ol-[3,2-c]-1'-methyl- 5-amino-pyrazole: M.P. 257-260" C.; [u] =+33 (chloroform); crystallization from methanol.

Swestrane-lZB ol [3,2-c]-1-methyl-5'-amino-pyrazole: M.P. 300 C.; [a] (pyridine); crystallization from methanol.

Androst 4 ene l7fl-ol-[3,2-c]-1' methyl 5' aminopyrazole: M.P. 270 [a] =|94 (pyridine); crystallization from ethyl acetate.

170a methyl androst 4 ene-17,8-ol-[3,2-c]-1-methyl- 5'-amino-pyrazole: M.P. 238-240 C.; [0c] +90 (pyridine); crystallization from ethyl acetate-ethyl ether.

EXAMPLE NO. 3

14 parts of a 10.4% aqueous sodium nitrite solution were added while stirring, over a period of 1 hour, to a solution of 7.5 parts of 5ot-androstane-17fi-ol-'[3,2-c]-5'- ami'no-pyrazole in 1000 parts of concentrated hydrochloric acid, such solution being cooled to 15 C. prior 4.62; (2165 cmf EXAMPLE NO. 4

1 7 :x-M ethyl-5 oc-A ndrostane-J 7B-0l- [3,2 -c] -5 '-Diaz0- Pyrazole Starting from 3.7 parts of 17a-methyl-5a-androstane- 17a-ol-[3,2-c]-5'-amino-pyrazole and using the same procedure as in Example 3, 2.95 parts of 17a-methyl-5aandrostane 17B ol-[3,2-c]-5'-diazo-pyrazole were obtained; decomposition at about 0.; LR. 4.6311. (2160 cm. Y

EXAMPLE N0. 5

5 oz-A rtdrostane-J 7 fi-Ol- [3,2-c] -Pyraz0le-5 '-Diaz0- chloride androstane-17fl-ol-[3,2-c]-pyrazole 5'-diazochloride; M.P.

244 247 C.; [a] =-|72 (methanol); LR. 4.4;4 (2265 (Em- EXAMPLE NO. 6

5 oc-A ndrostane-I 7,8-01- [3,2-c] -5 -l' odo-Pyrazol e Five parts of potassium iodide were added to a solution of 4 parts of 5a-androstane-l7fi-ol-[3,2-c]-5'-diazo-pyrazole in 200 parts of acetone and 40 parts of water. The mixture was then cooled to C. and 4.5 parts of a 55% solution of hydriodic acid were added with stirring. After the nitrogen formation ceased, the solution was decolorized with a sodium bisulfite solution, neutralized and diluted with water. After drying and recrystallizing from ethyl acetate, 1.2 parts of Sa-androstane-Ufi-ol-[3,2- c]-5-iodo-pyrazole were obtained; M.P. 264 C. (with decomposition); [oc] =|-57 (ethanol).

1 7 u-M ethyl-5 u-Androstane-I 7/3-01- [3 ,2-c] -5 -I odo- Pyrazole Starting from 2 parts of 17a-methyl-5a-androstane-17,8- ol-[3,2-c]-5-diazo-pyrazole and using the same procedure just described, 0.32 part of 17a-methyl-5ot-androstane-17B- ol-[3,2-c} -5'-iodo-pyrazole were obtained (the product had a M.P. 275 C., and [a] =+7-2 (ethanol)).

EXAMPLE NO. 7

5 a-A ndrostane-l 75-01- [3 ,2 -c] -5 '-Br0m0-Pyraz0le One part of potassium bromide and 2 parts of a 48% solution of hydrobromic acid were added to a solution of 0.5 part of 5a-androstane-17fi-ol-[3,2-c]-5-diazo-pyrazole in parts of acetone and 6 parts of water, on cooling to about 0 C. In the presence of catalytic amounts of cuprous salts, a nitrogen development took place. The mixture was neutralized with ammonia and extracted with ethyl acetate. 0.12 part of 5a-androstrane-17fi-ol-[3,2-c]- 5'-bromo-pyrazole were recovered from the organic phase: the product had a M.P. 376-378 C., and [a] =+62 (pyridine).

EXAMPLE NO. 8

Four parts of a 5.25% solution of sodium nitrite were added with stirring, over a period of 1 hour, to a solution of 1 part of 5a-androstane-1713-ol-[3,2-c]-1'-methyl-5- amino-pyrazole in 80 parts of concentrated hydrochloric acid, while cooling to about -l0 C. Thereafter, 0.2 part of powdered copper were added and stirring was continued for a further 60 minutes, the temperature being maintained in the range from 8 to 3 C. Sodium hydroxide was then added until neutrality was reached, the solution was extracted with ethyl acetate, and the extract was washed with ammonia and water until neutral; it was then evaporated to dryness and chromatographed on alumina. From the ethyl ether-ethyl acetate (2:8) fractions, 0.21 part of 5a-androstane-l7B-0l-[3,2-c]-1'- methyl-5'-chloro-pyrazole were recovered. The product melted at 204-208 C. (after recrystallizing from ethyl ether); [a] =+77 (chloroform).

2.5 parts of 5a-androstane-17B-ol-[3,2-c]-pyrazole-5- diazo-chloride were refluxed for 20 hours with 50 parts of water and 6 parts of tetrahydrofuran. Thereafter the mixture was concentrated under vacuum and extracted with ethyl acetate, and the product was chromatographed on acid alumina. Yield: 0.46 part of 5a-androstane-17fl-ol- [3,2-c]-5-hydroxy-pyrazole; M.P. 290 C.; [a] =+5=3 (pyridine).

(3 The following compounds were prepared by the same procedure from the corresponding -[3,2-c]-pyrazole-5-diazo-chlorides:

17oz methyl 5oz androstane-l7B-ol-[3,2-c]-5-hydroxypyrazole: M.P. 256-26 1 C.; [a] =+53 (ethanol); crystallization from methylene chloride.

5a androstane 17B ol [3,2-c]-l'-rnethyl-5'-hydroxypyrazole: M.P. 388392 C.; [a] =-{-49 (benzyl alcohol).

17cc methyl 5a androstane-17B-ol-[3,2-c]-l'-methyl- 5-hydroxy-pyrazole: M.P. 378-383 C.; [a] =+52 (benzyl alcohol). What We claim is: 1. A compound of the formula e wherein R, R and R are members selected from the group consisting of hydrogen and methyl, R is a member selected from the group consisting of amino, hydroxy, chloro, oromo and iodo, and X is a member selected from the group consisting of a single and a double bond.

2. 5 wandrostanel 7f3-ol- 3,2-c] -5 '-amino-pyrazole.

3. 17a-methyl-5ct-androstane-175-01-[3,2-c]-5'- amino-pyrazole.

5. Androst-4-ene- 17,6-0-1- 3,2-c] -5 '-amino pyrazole.

8. 17 -methyl-SQL-andmstane-17fi-ol-[3,2-c]-1'- methyl-5 21mmo-pyrazole.

9. 5a-estranc-l7,8-ol-[3,2-c]-l-rnethyl-5'-aminopyrazole.

10. Androst-4-ene-l7/3-ol-[3,2-c]-1-methyl-5'- amino-pyrazole.

l2. Swandrostane-IZB-ol-[3,2-c]-5-di&o-pyrazole.

13. l7a-rnethyl-5a-androstane-17,8-01-[3,2-c]-5- diazo-pyrazole.

14. 5a-androstane-l7B-ol-[3,2-c]-pyrazole-5-diazochloride.

16. 17a-methyl-5a-androstane-175-01-[3,2-c]-5'- ido-pyrazole.

l7. 5 a-androstane- 17fl-ol- 3,2-c] 5 -bromo-pyrazole.

18. 5a-androstane-17fl-ol-[3,2-c]-1'-methyl-5'- chloro-pyrazole. 19. 5oz-androstane-l7/3-ol-[3,2-c]-5'-hydroxypyrazole'.

20. 17a-methyl-Sa-androstane-17,8-01-[3,2-c]-5'- hydroxy-pyrazole.

2l. 5a-androstane-17fl-ol-[3,2-c]-l'-methyl-5-hydroxy-pyrazole.

22. l7ct-methyl-5a-androstane-17B-ol-[3,2-c]-1'- methyl-S -hydroxy-pyrazole.

B3 A Rz-N No references cited.

LEWIS GOTTS, Primary Examiner, 

1. A COMPOUND OF THE FORMULA 